出版日期：2015-05-01 00:00:00

著者：Wen, Liang-Chang; Tsai, Yun-I; Hsu, Tzu-Huan; Wang, Ching-Hsien; Wu, Mong-Shin; Kao, Huey-Chuen I.; Lee, Maw-Chwain

著錄名稱、卷期、頁數：Journal of the ceramic society of Japan 123(5), pp.367-373

摘要：A series of (Gd2-xLix)Ti2O71x with x = 0.050-0.150, abbreviated as GLT-2L were prepared by the addition of 2x mole of LiO0.5 self-flux in the parent compound. Preparation temperatures were between 1450 and 1500°C depending on the amount of the self-flux addition. Relative densities of all GLT-2L samples were larger than 97.9(3)%. However, the parent compound, Gd2Ti2O7 has no LiO0.5 co-existence, it has a relative density of 92.8(4)% only, although it was prepared at a higher temperature, 1650°C. Among the GLT-2L samples, the one with x = 0.110 has the highest total electrical conductivity, 6.17(6) x 10-5 S•cm-1 at 700°C and the lowest activation energy, 0.95(3) eV. Doping Li+ ions into the Gd-site of Gd2Ti2O7, preparation temperature was lowered and samples become denser. Meanwhile, vacancies were created and electrical conductivity was increased. At 500°C, average ionic transference numbers (ti) found for all samples are fully ionic. Increasing temperature, ti decreases slightly due to the increase of the fractional electronic conductivity of the (Gd2-xLix)Ti2O7-x, which is a mixed conductor at high temperature. Ti atoms are in the mixed valence states.

關鍵字：Pyrochlore;Titanate;Flux;Electrical property;Oxide-ion conductor

語言：en_US

期刊性質：國外

收錄於：SCI

產學合作：國內

通訊作者：Liang-Chang Wen

審稿制度：否

國別：JPN

出版型式：電子版